What should I do?!??!?!?

Okay so in band we had to get in groups and perform a midterm ignment. We were igned Minuet. The thing is a crazy girl gave me the hardest parts with notes ive never played before, and we have to memorize it! We have to play it tomarrow and I know NOTHING! I am really scared because i'll get a horrible grade, and just be embarrased infront of the whole cl. I thought I could get out of it by saying I broke my clarinet but my band teacher took it and said hell fix it by cl tomarrow. What can I do to get out of cl. If I skip cl they call my parents and I get into even MORE trouble! HELP! what sould I do?!?!?!